Multiple-tire-mold-engraving machine



March 10, 1931. R BOYLE 1,796,079

MULTIPLE TIRE MOLD ENGRAVING MACHINE Filed Dec. 14, 1925 6 Sheets-Sheet 1 FIG. 1

ROBERT S. 50 f INVENTOR.

BY WWW A TTORNEYS March 10, 1931.' RSB YLE 7 1196079 I MULTIPLE TIRE MOLD ENGRAVING MACHIN E Filed Dec. 14, 1925 6 Sheets-Sheet 2 FIG. 2

PC5597 5 BOYLE- INVENTOR.

A TTORNEYJ March 10, 1931.

R. s. BOYLE 1,796,079

MULTIPLE TIRE MOLD ENGRAVING MACHINE Filed Dec.

14, 1925 6 Sheets-Sheet s y FIG. ROBERT s. BOYLZ- INVENTOR.

ATTORNEYS March 10, 1931. I 5 BOYLE 1,796,079

MULTIPLE TIRE MOLD ENGRAVING MACHINE Filed Dec. 14, 1925 6 Sheets-Sheet 4 FIG. 4

R05/f/Q7'5 BOYLE INVENTOR.

BY WWW A TTORNEYQ- March 10, 1931. R, S B Y E' 1,796,079

MULTIPLE TIRE MOLD 'ENGRAVING MACHINE i Filed Dec. 14, 1925 6 Sheets-Sheet 5 g Z 34 w ,QofizRf s 50x4 E-INVENTOR.

A TTORNEYS March 10, 1931. R s BQYL 1,796,079

MULTIPLE TIRE MOLD ENGRAVING MACHINE Filed Dec. 14, 1925 6 Sheets-Sheet 6 79 FIG. 11

FIG. 1

RT 5. BOYLE INVENTOR.

By- @mm A TTORNEY5 Patented Mar. 10, 1931 OFFICE ROBERT S. BOYLE, F AKRON, OHIO MULTIPLE-TIRE-MOLD-ENGRAVING MACHINE Application filed December 14, 1925.

The present invention relates to a tire mold engraving machine, and has for one of its objects to provide a machine of this character which embodies novel features of construction, whereby it can be operated in tandem to engrave a plurality of tire molds at the same time. At the present time the tire molds are each cut or engraved separately, and since the engraving of a tire mold is an exacting and time consuming operation there is a great saving entailed where two or more of the tire molds are engraved at the same time.

A further object of the invention is to pro vide a tire mold engraving machine in which the movements of the cutter and tire mold are effectively controlled from the pattern plate, so that an accurate reproduction of the pattern is obtained upon the curved inner face of the mold, I a

The invention further contemplates an engraving mechanism which has a maximum degree of adjustment and can be arranged to cut a design upon the inner portion of theperiphery of the annularcavity of the mold as well as upon the outer portion of the periphery thereof. y

Means are also provided for counter-balancing the cutter mechanism so that the several cutter mechanisms can be readily operated and controlled from a single pattern plate. a

The invention further provides means for adjustably connecting the various cutter mechanisms so that they can operate effectively upon tire molds which are at slightly different elevations, thereby enabling the machine to operate efficiently even though the tire-molds may not set upon the turn-tables with entire uniformity.

While two particular forms and embodiments of the invention will be shown and described in detail for illustrative purposes, it will be understood that many'modifications and changes can be made in the details of construction without departing from the spirit of the invention. For a full understanding of the invention "reference is to be had to the following description' and accompanying drawings, in which Figure 1 is a front elevation ofa tire mold shaft.

Serial No. 75,243.

ate upon the inner periphery of the mold cavity being indicated by dotted lines.

Figure 2 is an end view of the machine. F lgure 3 1s a transverse sectional view through the machine, taken on the line 3-3,

of Figure 1, and looking in the direction of -the arrows.

".Figure 4 is a top plan view of the machine with the cutters and cutter supporting carriages removed, the rear portion of the frame being broken'away to illustrate more clearly the gear mechanism for advancing the turntables to successively bring different areas of the tire molds into position under the cutters.

Figure 5 is an enlarged elevation of one of the cutting mechanisms, the segmental cover plate being removed.

Figure 6 is an end view thereof.

Figure 7 is a detail view of the segmental cover plate.

Figure 8 is a sectional view through the cutter arm on the line 88 of Fig. 6.

-Figure 9 is a segmental view on the line 99 of Fig. 6.

, Figure 10 is a detail view of the connecting link between the piston of the air cylinder and the slide which carries the cutter Y Figure'll is a top plan view of one end of a machine which embodies a modified construction, portionsbelng broken away and shownin section.

Figure 12 is a front elevation thereof with parts broken away and shown in section.

Figure 13 is a detail view of the slide which operates within the slotted arms and also of tables, depending upon the number of tire molds or analogous articles which it may be desired'to engrave or out at a single operation. In the present instance the machine is constructed for-engravingtwo tire molds at a single operation, and two circular bed plates -2 are shown as bolted or otherwise rigidly secured to the main frame. These bed plates.

are horizontally arranged and have turn-ta- 'bles 3 arranged above the same,a bearing ring 4 being-interposed between each of the bed plates and the corresponding turn-table. An

anti-friction bearing 6 is interposed between the center of the turn-table and'thebed plate and the numeral 7 designates the pipe for anoil drain system of any conventional character. Each turn-table 3 and bearing ring 4 is formed upon the lower face thereof with an annular ,V-shaped-rib 8, the rib of the turn 7 table beingloosely'received within a corresponding depression in the upper face of the 7 bearing ring, while the rib of the bearing ring is looselyreceived within a correspondingly shaped; depression in the upper face of the bedplate.

A worm gear ring 9 is rigidly secured to" the lower face;of'each of the turn-tables .8,

andthese worm gears mesh. with worms 1() which are rigidly applied to a worm shaft 11 extending longitudinally of the main frame 1 at the back'.thereof. Each of the worm gear'rings 9 is formed in the lower face thereofwith an annular T-shaped slot 12 which receives the head of aclamping bolt 13, said clam ing bolt extendingthrough an 'opening ormed in a lateral arm 14 pro ecting from the bearing ring 4. A nut 15 is threaded .upon

each of the clamping bolts, said nuts being formed with arms 16 which are connected by links 17 to a hand lever 18 arranged at one end of the machine. With this construction it will be obvious that when thehand lever is movedin one direction the nuts 15 will be tightened and the gear rings 9 clamped with the bearing rings. Since the gearrlngs are r1g1dly secured to the turn tables 3 the latter can then be held rigid with the bearing rings. On the other hand when the hand lever 18 is moved in the opposite di-' rection the nuts 15 will be loosened on the clamping bolts 13 and the gear rings released so that the turn-tables can move independently of-the bearing rings.

Arranged at opposite ends of each of the worms 10 are bearings 19 within which the worm shaft 11 is journaled, said bearings being carried by slides 20 which are mounted to move within guide-ways 21. By reference to the righthandend of Fig. 4 it will also be observed that each of the bearing rings 4 isp'rovided at the back thereof with a short segmental rack 22 meshing with a straight rack 23 on the corresponding slide20, thereby holding the bearing rings against rotation when the turn-tables'are adjusted, but permitting a limited back and forth oscillation thereof as the slides 20 move in the guide ways 21. One end of the worm shaft 11 has .a feather .and spline connection 24 with a shaft 25 ofthe indexing mechanism. This shaft has an indexing gear 26 applied to the end thereof, said indexing gear meshing with a master gear 27 'which is adapted to be turned by means of a crank handle 28. The J ratio of the gears is such that'one complete revolution of the master gear 27 will rotate Y the turn-tables a sufficient amount .to bring fresh portions of the mold .surfaces into operative position. For this work it may be desired to use indexing gears26 of various sizes,

'in position on the turn-tables 3' in any suit able manner with the axes of the tire mold sections concentric with thepivot centers of the turn;tables. The forwardly projecting lateral arms 14 of the bearing rings-4 are connectedby a rod 30'so that they must oscillate in unison, the degree ofo'scil'lation' duringthe cutting action being" controlled by the pattern plate, as will be hereinafter described, so that a cut of the desired configuration can be made ineach of the mold sections. During the cutting operation the turn-tables 3 are. securely clamped to the bearing rings 4 by means of the clamping bolts 13, and as the turn-tables oscillate the worm shaft 11 is reciprocated longitudinally andthe slides 20 of the bearings19 moved back and forth within the guide ways 21, said movement of the Worm shaft being permitted by the feather and spline connection 24. When it is desired to advance the turn tables to bring fresh portions of the tire molds in position under the cutters, the hand lever 18-i's first actuated to loosen the clamping bolts 13 and release the connection between the turn-tables 3 and the bearing rings 4, after which the master gear 27 of the in-v dexing' mechanism is given one complete revolution, thereby operating through the worms. 10 and worm gear rings 9 to rotate the turn-tables the required amount upon the bearing rings. The hand lever 18 is then again actuated totighten the clamping bolts 13 and secure the turn-tables'to the bearing rings preparatory to starting the cutting 1 mechanism into operation.

The baekof the, main supporting frame 1 is formedwith an upwardly projectingpor tion 1 which supports ahollow horizontal rail portion 31.- A main carriage 32 is mounte'd upon'the'rail 31- for movement in a horizontal direction, being'showi as provided with clips 33 which slidably engage upwardly and downwardly projecting flanges 34 at the front of the rail 31. The carriage is formed with one or more lugs 35 which project into the interior of the hollow rail .31 through a slot 36 in the front'of the rail. These lugs 35 have a threaded engagement with an adjusting shaft 37 which extends longitudinally through the rail 31, being journaled in suitable bearings and provided at the end thereof with a hand wheel 38.- With this construction it will be obvious that the car riage 32 is movable along the horizontal rail 31 and can be set at any desired position thereon by manipulating the hand wheel 38.

The main carriage 32 is provided .at suitable i-ntervals with. cutter carrying frames 39 which are mounted for vertical move ment thereon. These cutter carrying frames 39 are mounted upon vertical guide Ways 40 with which the main carriage is provided and are movable up and down by means of the vertical adjusting screws 41. The upper ends of these screws 41 are shown as provided with polygonal heads which may be engaged by a suitable wrench when it is desired to adjust the frames up and down. The cutter carrying frames 39 project downwardly below the main carriage 32 and have cutter arms 42 pivotally connected thereto at 43. A cutter shaft 44- is journaled in each of the cutter arms, one end of the shaft extending beyond the arm and terminating in a suitable cutting head 45, while the. other end of the shaft is suitabl geared to a sprocket wheel 46. This sproc et wheel receives power from an electric motor 47 which is mounted on the upper end of the cutter frame, the power being transmitted through sprocket chains 48 which engage intermediate sprocket wheels 49 which are carried by the swinging arms 50 and mounted upon the pivotal connection between the arms. The opposite ends of the swinging arms 50 are pivotally connec'ted to the motor and cutter arm, respectively, and these arms will swing about their pivotal connections and maintain a driving connection between the motor and the cutter shaft at all positions of the cutter arm as the latter is rotated about its pivot 43.

The rear end of the cutter arm 42 .slidably engages a segmental guide 51 which assists in directing the cutter arm in its movements, and a cover plate 52 is arranged over each of the cutter arms to provide a housing therefor.

Carried by each of the cutter arms 42 is a segmental rack 53 which meshes with corresponding'racks 54 on sections of a horizontally disposed bar which extends longitudinally of the device and has the reciprocating movements thereof governed by the pattern plate. It will be obvious that longitudinal movements of the racks 54 will operate through the segmental racks 53 to swing the cutter arms 42 and shift the position of the cutting heads 45. In order that this may be done with a minimum amount of energy the cutter arms and driving mechanisms therefor are counter-balanced by means of weights 55 applied to lateral arms which project from the upper ends of the upper swinging arms 50 of the power transmission mechanisms. Each of the cutter arms is provided with a sultable pneumatic cylinder 56 which operates in a tomthereof, and a curved arm 61 which projects downwardly from the slide 58 extends through this slot and has the end thereof pivotally connected at 62 to a corresponding lateral arm 63 on the bearing ring 4 of the adjacent turn-table 3. Just below the guideway 57 the arm 61 is provided with a rack 64 which is engaged by a pinion 65 at the pivot end of a hand lever 66. With this construct1on it will be obvious that when the hand lever is manipulated the slide 58 and pattern plate 59 are reciprocated transversely of the mechanism and at the same time the turntables are oscillated through the action of the arms 61 and 63. As will be hereinafter described, this oscillating movement of the turn-tables is controlled by the pattern plate.

The pattern plate 59 has an opening or depression 59 therein which has the same shape or configuration as the cuts which it is desired to produce in the tire mold sections A. A follower pin 67 projects into the opening of the pattern plate 59, being shown as carried by the lower end of a vertical bar 68, which is adjustably secured by means of a clamp 69 to the forward section 70 of the cutter controllingbar, the rear section 70 of the said bar being adjustably secured to the section 70. The meeting ends of the sections 70 and 7 0 of the cutter controlling bar are each fo'rmedwith a transverse head 71, said heads being slotted and connected by clamping blts 72 whichfextend through the slots. The

two sections 7 0 and 7 0" of the bar can thus be rigidly connected and held either in alignment with each other or in an off-set relation, the latter adjustment being necessary when the cutter carrying, frames 39 are at different elevations. The end of the section 7 0* of the bar to which the vertical bar 68 of the follower pin is clamped passes throu h a guide 73 and is formed'with a rack 74 w ich is engaged by a pinion 75. This pinion is rigid with the pivot end of a hand lever 76 so that by swinging the hand lever the cutter shifting bar can be reciprocated back and forth, the-movements of the bar being limited by the engagement of the follower pin 67 with theiwalls of theopening 59 of the pattern plate. J

7 The tire mold sections A, or other articles to be cut or engraved by the-machine, are mounted upon the respective turn-tables 3 and oscillated withthe turn-tables in a horizontal plane. The distance between'the pivot centers 43 of the cutters is equal to the distance'between'the centersof the turn-tables, and after the tire mold. sections have been clamped upon the turn-tables the main carriage 32 is shifted horizontally upon the rai 31 until the cutters are brought intoproper position over the .respective tire mold 7 sections. The cutter em ing frames 39 may then be vertically adjusted to brin the 'cut- ,ters into engagement with the wor h, whereupon the sections 70? and 70 of the cutter moving bar are clamped together by tightening the-bolts 72. With the pattern plate in position and the follower pin 67 projecting into the opening of the pattern plate, the cutters are caused to operate. The turn-tables are oscillated in a horizontal plane by means of the hand lever 66, the degree of movement being determined by engagement of the end walls of the opening in the pattern plate with a the follower pin as the pattern plate is moved back and forth. Simultaneously the operator moves the hand lever 7 G and reciprocates the -cutter m ovingbar, whereupon the cutters are 'moved' in a vertical plane at substantiallyright angles with the plane of movement of the tire mold sections. Theamplitude of movement of, the cutter moving bar is governed by engagement ofthe follower pinwith the side walls of the opening in-the pattern plate. 'lhemovements of'the turn-tables and cutters are thus controlled from the pattern plate, so that a depression corresponding exactly to the shape of the openingin the pattern plate will be cut in each of'the tire moldsections. Thereis apositive connection between the two turn-tables and also between the two cutting mechanisms, so that two of the tirejmold sections can be effectively engraved at the same time, and there is no lost section less accurate or positive than of the desired to cut a design upon the inner pe-' .motion or loose connection which would tend to make the cutting of the second tire mold first tire mold section. WVhen the design of the 'pattern plate has been cut in each of the tire mold sections, the turn-tables are rotated, as has been previously-described,,to bring a. fresh portion of each of the tire mold sections under the cutters. Thecutting op-- eration isthen repeated and this is done until. the design has been reproduced atproper intervals around the entire periphery of the tire mold sections. In the event it should be riphery of the tire Inold sections, the main carriage. can .be moved horizontally upon the rail-31 to bring the cutters in position over diametrically opposite portions of the tire mold sections, thereby causing each cuta ter to assume the positionwhich is indicated by'dotted lines atthe right hand end of Figure '1. It is frequently necessary to cut the tire mold sections at this point, and alot of expensive hand work -can be avoided by the present construction which'enables this to be done by the same machine whichis used for cutting the depressions in the tread forming portions or the mold sections. WVhen the main carriage is moved into position to enable the cutters to operate upon the inner periphery of the tire mold, as just described,- a longer bar member 7 0" is substituted for the short form ,of the bar-membershown on the drawings. a p r As shown on the-drawings, the opening 59 of the pattern plate has the shape of a diamond, and the depressions B inthe pattern plate, Figure 4, are similar in shape but smaller in size. Anyother desired shape of opening might be formed in the pattern plate and'would be duplicated in the tiremold sections.

A modified form of the invention is shown by Figures 11 to 13 in which thepattern plate 59 instead of being movable is rigidly mounted upon a small shelf 77 which is ar- .rangcd at the left-hand end of the machine."

83, said pinion being rig-id with the. pivot end of a hand lever 84 so that by manipulat ing the handlever theslotted arm is moved in 'adirection transverse to itself.- The ampli "tude' of movement which-is possible being determined by the engagement of the follower pin 78-with the side walls ofthe opening 59 in the pattern plate. A slotted bracket 85 projects upwardly from the arm 80 and hasthe section 70 of the cutter moving bar connected thereto by means of a bolt 86. The end of the slotted arm 81 is extended downwardly at 8F- and connected by a link 87 to one armof a bell crank lever 88 which is suitably mounted upon the main supporting frame. The downwardly extended arm 81 of the slotted arm 81 has a suitablerack and pinion connection 89 with a handlever 90 and is mounted upon a guide-way 91 which directs it'in' its movements. By manipulating the hand lever 90- the slotted arm 81 is movable .ina direction transverse to itself, the degree of movement being determined by engagement of the follower pin 78 with the walls of they opening 59 in the pattern plate.

ing a plurality of annular objects, including a plurality of turn-tables for supporting the annular objects, bearing rings for the turntables, means for releasably clamping the turn-tables to the bearing rings, gear rings on the turn-tables, slidably mounted gear members engaging. thegear rings for simultaneously moving the turn-tables when they are released from the bearing 1' ing's,.said gear members sliding back and forth as the turntables are oscillated, connecting means between the bearing rings for causing them to oscillate in unison, means for oscillating the bearing rings, cutting tools arranged opposite the respective turn-tables and pivotally mounted to swing in arcs transverse to the turn-tables, connecting means between the cutting tools for swinging the same in unison, a'pattern plate, and means cooperating with the pattern plate to control the oscillation of the bearing rings and swinging movements of the cutting tools. v

3. A machine for simultaneously engraving a plurality of annular objects, including ,a plurality of turn-tables'for supporting the annular objects, bearing rings for theturn tables, means for releasably clamping the turn-tables to the bearing rings, gear rings on' the turn-tables, gear members engaging the gear rings for advancing the turn-tableswhen they are released from the bearing rings, slidably mounted'bearings for the gear members, interlocking gear members between the slidably mounted bearings and the respective bearing rings whereby the said bear ings' slide back and forth when the bearing rings are oscillated, connectlng means between the bearlng rings for causing them to oscillate in unison, means for oscillating the hearing rings, cutting tools arranged opposite the respective' turn-tables and pivotally mounted to swing in arcs transverse thereto, connecting means between the cutting tools for causing them to swing in unison, a p'at tern plate, and means cooperating with the pattern plate to control the oscillation of the bearing rings and the swinging movements of the cutting tools. I Y

4.'A machine for simultaneously engraving a plurality of annular objects, including a plurality of horizontally disposedturntables for supporting the annular objects, connecting means between the turn-tables for causing the sametooscillate in unison,

- means for oscillating the turntables, a main carriage mounted to slide horizontally above the turn-tables, a plurality of cutter-carrying arms fixedly 'mounted'upon the main carriage and spaced apart to correspond to the distances between the turn-tables'and pivotally mounted to swing in planes transverse to the turn-tables, connecting means between the cutter carrying arms for swing-' ing the same in unison, a pattern plate, and

means cooperating with the pattern plate t0 control theoscillation of the turn-tables and the swinging movements of the cutter carry-- ing arms. v I

5. A'machine for simultaneously engravlng a plurality of annular ob ects, lncludlng a plurality of horizontally disposed turntables for supporting the annular objects,

several cutter carrying arms to swing the same in unison, a pattern plate,* and means cooperating with the pattern plate to govern the oscillation of the turn-tables and the swinging movements of' the cutter carrying arms. I

v 6. A machine for simultaneously engrav ing a plurality of annular objects, including -a plurality of horizontally disposed turntables for supporting the annular Objects,"

means for oscillating the turn-tables in unison, a cutter carrying frame foreach turntable, cutters pivotally mounted thereon to swing in arcs transverse to the turn-tables, a horizontally reciprocating bar for swinging each cutter, an adustable connection between the bars whereby they. maybe connected either in or out of alinement with each other,

'ous movement of the cuttersfa pattern plate, andmeans cooperating with the pattern plate for governing the oscillation of the turntables and thefreciprocation of the horizon tal bars of the cutters.

7. A machine for'simultaneou-sly engrav ing a plurality of annular'objects, including a plurality ofhorizontally disposed turntables for supporting'the annular objects, means for simultaneously oscillating the turn-tables, a cutter carrying frame provided for each turn-table and mounted for vertical means for actuating the bars for simultaneadjustment relative thereto,-cutters, carried by the respective frames and pivotally -mounted to swing in arcs transverse to the turn-tables,- horizontally reciprocating cutter actuating bars for the respective cutters,

means for adjustably connecting the cutter actuating bars to allow for relatively vertical adjustment of the cutter carrying frames,

'means for moving the cutter actuating bars for simultaneous movement of' the cutters, a pattern plate, and means cooperating therewith to control the oscillation of the turntables and movements of the cutter actuating bars. i

8'. machine for simul'aneously engraving a plurality of annular objects, including a plurality othorizontally disposed turntables for supporting the annular objects, means for simultaneously oscillating the turn-tables, a cutter carrying frame for each turn-table, means for vertically adjusting turn-tables and tllfilllOVGlDGIltS of the reciprocating bars. r

9. A machine for simultaneously engraving a plurality of annular objects, including a plurality of turn-tables for supportng' the annular objects, lateral arms rigid with the turn-tables a bar pivotally connecting the lateral arms for causing the turn-tables'to oscillate in unison and operating by pushing and pulling, a cutter frame for each turntable, cutter carrying arms pivotally mounted thereon to swing in planes transverse to the turn-tables, a reciprocating bar operatively connected to the cutter carrying arms for simultaneously swinging the same, a slidably mounted pattern plate support, an operative connection between the same and one of the turn-tables, and a follower pin carried by the reciprocating bar and adapted to engage the pattern plate.

10. A machine for simultaneously engrav-.

ing a plurality of annular objects, including a plurality of turn-tables for supporting the annular objects, means for connecting the turntables to oscillate in unison,.a cutter frame for each turn-table, cutter carrying arms pivotally vmounted upon the respective I cutter framesand arranged toswing in planes transverse to the turn-tables, segmental racks upon the cutter carrying arms, a rack bar engaging the segmental racks for simultaneously swinging the cutter carrying arms, a pattern plate support, a guide-way upon which the pattern plate support is slidably bar.

11. A machine for engraving an annular object, includingfa turn-table to support the "object, means for oscillating the turn-table, aeutter arm pivoted to swingin a plane transmounted, a lateral arm projecting from the pattern plate support and operatively connected to one of the, turn-tables, and a follower pin carried by the rack bar and adapted to engage the pattern plate for cooperation therewith to govern the movements of the pattern plate support and reciprocating verse to the turn-table, a segmental rack rigid with the cutter carrying arm and arranged in the plane in which the'arm swings, a reciprocating rack bar and arranged in the plane ofand engaging the segmental rack to swing the cutter arm, a pattern plate, and means cooperating with the pattern plate to govern the oscillation of the turn-table and the reciprocation of the rack bar.

12. A machine for engraving an annular object, including a turn-table to support the object, a cutter carrying frame pivotally mounted to swing in a plane transverse to the turn-table, asegmental rack rigid with the cutter carrying arm and arranged ,in the plane in which the arm swings, a reciprocating rack bar arranged in the plane of and engaging the segmental rack, a pattern plate support, a guideway upon which the pattern plate support is slidably mounted, an operative connection between the pattern plate-support and the turn-table, and a follower pin carried by the rack bar for cooperation withthe pattern to govern the movements of the rack bar and pattern'plate support, the rack bar being subjected only to a pushing and pulling action.

.'13.'A machine ofthe character described, including a cutter arm, a slide thereon, a cutter carried by the slide, a link connected to the slide for moving the same to advance the cutter, and wedge means cooperating with the link to lock the parts against play .when the cutter is in operative position.

'14. A machine of the character described, including a cutter arm, a slide thereon, a cutter carried by the slide, a link connected to the slide for advancing the cutter, said link being formed with a beveled face, and a block retract the cutter, said link being formed with a beveled face, a block having a beveled face which is arranged for cooperation with the beveled face of the link to lock the parts against looseness when the cutter is in operative position, and means for adjusting the position of the block.

16. A machine for simultaneously engraving a plurality of annular objects, including a plurality of horizontally disposed turntables for supporting theannular objects, means connecting the turn-tables to cause them to oscillate in unison, cutting tools piv-' otally mounted to swing in the same vertical plane and operatein arcs transverse to the motion of the turn-tables, connecting means between the cuttingtools for simultaneously moving the same including a reciprocating main carriage for Vertical movement toward bar which operates by pulling and pushing, a pattern plate, and means cooperating therewith for controlling the movements of the turn-tables an d reciprocating bar.

17 A machine for simultaneously engraving a plurality of annular objects including 7 a plurality of horizontally disposed turntables, .means for simultaneously oscillatingthe turn-tables, a main carriage mounted for horizontal movement above the turn-tables, cutter frames adjustably mounted upon the and away from the turntables, cutter carrylng arms pivotally mounted upon the cutter frames and arranged to swing in planes transverse to the turn-tables, a segmental rack rigid with each cutter carrying arinand arranged in the plane in which the arm swings, a horizontally reciprocating rack bar engagingthe segmental racks to cause simultaneous swinging of the cutter carrying arms, a

pattern plate, and means cooperating with each comprising a work support, a cutter,

and means supporting said work support and said cutter for relative movement two-dimen- .sional along the surface of the bl'ank'being engraved; a single actuating means connected to said units in tandem for effecting such movement in all ofsa'id units in unison; and a single control means comprising cooperating pattern members and effective to limit the operations of said actuating means to produce such in'ovement only within the.

limits of a design predetermined by the cooperating characteristics' of said pattern members. I 4

19. Engraving mechanism comprising a pair of units disposed horizontally spaced from each other in tandem and alined and each comprising a work support, acutter, and means supporting said work support and said cutter for relative movement two-dimensional along the surface of the blank being ongraved but limited in extent to provide only for engraving over a limited area; and a single spacing means connected to said units in tandem for periodically effecting additional such relative movement in all of said units in 'unison to thus periodically space all of-said units in unison for successively engraving additional areas.

20. Engraving mechanism comprising a pair of units disposed horizontally spaced from each other in tandem and alined and each comprising a work support, a cutter, and means supporting said work support and said cutter for relative movement two-dimensional along the surface of the blank being engraved but limited in extent'to provide forengraving over' only a limited area; a single control means comprising cooperating pattern members' and effective to limit the operations of said actuating means toproduce such movement within such area only within the limits of a design predetermined bythe cooperat-' ing characteristics of said pattern members; and a single spacing means connected to said units in tandem for producing additional such relative movement in all of said units in .unison' for successively engraving such design on successive areas.

21. Engraving means comprisinga plurality ofi unit's disposed'horizo ntally spaced from each other, in tandem and alined and each comprising a work support, a cutter,

and means supporting said work support and said cutter for relative movement two-dimensional along the surface being engraved; a single actuating means connected to said units in tandem for effecting such relative movement in all of said units in unison, but only to a limited extent for engraving over a lim- 'ited area; and a single spacing means lnterposed between said actuating means and each of said un1ts and effective to continue per1od1- cally, in all of said unitsv in unison, a movement produced by said actuating means, to thus periodically space all of said units in unison for the engraving in unison of successive areas.

22. Engraving mechanism comprising a pair of units disposed horizontally spaced from each other in tandem and alined and each comprising a rotary work support and a cutter mechanism movable transversely to produce relative-movement between said cutter mechanism and said work support twodimensional along the surface being engraved; a first actuation means for efiecting such work support actuating in all ofjsaid units in-unison; and a second actuating means for effecting such cutter mechanism movement in all of saidunits in unison, comprising reciprocating coordinating means connected to each of said cutter mechanisms and efiective to move all of said cutter mechanisms in unison upon reciprocation of saidcoordinat: ing means.

'23. Engravlng mechanism comprising a pair of units disposed horizontally spaced from each otherin tandem and alined and each comprising a rotary work support and a cutter mechanism comprising an operating sector and movable transversely to produce relative. movement between said cutter mechanism and said work support two-dimensional along the surface being engraved;' a first actuating means for efiecting such work support actuation in all of'said units in unison; and'a second actuating means for effecting such cutter mechanism movement in all of said units in unison, comprising rack means connected to each of said cutter mechanism operating sectors and effective to move all of- '24. Engraving mechanism comprising a pair of units'disposed horizontally spaced from each other in tandem and alined and each comprising a rotary work support and a cutter mechanism movable transversely to produce relative movement between said outter mechanism and said work support twodimensional along the surface being engraved; a first actuating means for effecting such work support actuation in all of said units in unison, comprising reciprocating means operatively connected to each of said work supports and effective to rotate all of said work supports in unison upon reciprocation of said reciprocating means; and a second actuating means for effecting such cutter mechanism movement in all of said units in unison, comprising reciprocating coordinating means connected to each of said cutter mechanisms and efi'ective to move all of said cutter mechanisms in unison upon v reciprocation of said coordinating means.

25. Engraving mechanism comprising a 'pflll of units disposed horlzontally spaced from each other in tandem and alined and each comprising a rotary work support and a cutter mechanism comprising an operating sector and movabletransversely to produce relative movement between said cutter mechanism and said work support two-dimensional along the surface being engraved; a first actuating means for eflecting such work support actuation in all of said units in unison, comprising reciprocating means operatively connected to each of said work supports and effective to rotate all of said work supports in unison upon reciprocation of said reciprocating means; and a second actuating means for effecting such cutter mechanism movement in all of said units in unison, comprising rack means connected to each of said cutter mechanism operating sectors and effective to i move all of said cutter mechanisms in unison upon reciprocation of In test mony whereof I affix my signature.

said rack means.

ROBERT S. BOYLE. 

